Note 3 - Earnings Per Share - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Net income		$ 7,068	$ 11,412
Weighted average common shares outstanding (in shares)		28,621	28,974
Weighted average common stock equivalents (in shares)			1
Total weighted average common shares outstanding and common stock equivalents (in shares)		28,621	28,975
Basic earnings per common share (in dollars per share)		$ 0.25	$ 0.39
Diluted earnings per common share (in dollars per share)	[1]	$ 0.25	$ 0.39
Dividend payout ratio		84.00%	51.30%

[1] For the three months ended March 31, 2019 and 2018, there were no common stock equivalents that were anti-dilutive.